FLOOD02718

• County: Logan
• Community: Logan County
• Stream Name: South Platte River, Pawnee Creek
• Basin: South Platte
• Title: Floodplain Information South Platte, Pawnee
• Date: 9/1/1978
• Prepared For: Logan County
• Prepared By: US Army Corps of Engineers
• Floodplain - Doc Type: Floodplain Report/Masterplan

GLOSSARY OF TERMS

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gener~l)y dr~wn to show s~rf~ce elevatIon for the crest of a
specIfIc flood, but m~y be prepared for conditions at ~ gIven time
orshge.

Flood
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An ovarflow On I"nds not normally coven><J by w"tar Md
th"t ~re used or ~sable by man. Floods have two essentllll cllllr-
~ctarlstlcs: (I) the inundation of l~nd Is temporary; and (2)
the land Is lldjacant to and Inundated by ovarflow from a river, a
stream, an ceaan, II lake, or other body of standing water.

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FloodSt<'IQe
The stage or elevation at Which overflow of tho natur~1
bllnksofastreamorbodyofwaterbeginsinthereachoraraa In
whiCh the elovatlon is measured.

Norn;ally,aflood Is considered as any temporary rIse In
streamflow or stage, but not the pondlng of Surface water, that
results In significant adverse effects in the vicinity. Adverse
effects may includa damagas from overflow of iand areas, temporary
backwater effects In sewers and local dralnllge channels, creation
of unsanitary condItions or other unfavorable sit~"tions by deposi-
tion of materials In stream channels during flood recessions, risa
of ground water coincIdent with increased straamflow, and other
problams.

H~dloss

The effect of obstructions, such liS narrow bridge open-
Ings or buIldings, that lImit the arell through which water must
flow, raisIng the surface of the water ~pstream from the Obstruc-
tion.

left6ank

The bank on the left sIde of II river, stream, or water
course looking downstream.

Flood Cr&st
The maximum stage or ~Ievatlon reaChed by the waters of
II flOOd at a ~Ivon location.

Reference Point
A numbered point Identifying a specific location used
for correlating the oata shown In varlo~s fo,.",s throughout the
report.

FloodPlain
The relatIvely flat area or low landS adjoining the chan-
nel of II river, stream, water co~rse, ocean, lake, or other body
of standing water which has bean or may be covered by floodwater.

Rlqht6ank
The blink on the right side of a rlvar, stream, or water
course looking downstream.

Flood Profile
A graph showing the rolatlonshlp of water surface eleva-
tion ~ location, the latter generally e~pre5sed as distance above
rrouthforllstreamofwaterflowingln;,nop"nchannel. It is

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10-,50-, 100-, and 500.Year Flood
AfIOOdhavlngaI0.2,I,or,2percentprobability,
respectively, of occurrence In any year or an average frequency
of occurrence Intheoroerofonce in 10,50, tOO, or 500 years,

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